Save entire Transform objects with childs

For starters, you need a save system. To create a save system you can use a basic skeleton for one here:

 using System;
 using System.IO;
 using UnityEngine.Windows;
 using System.Collections;
 using System.Runtime.Serialization.Formatters.Binary;
 using UnityEngine;
 using UnityEngine.UI;
 
 public static class SaveLoadManager {
 
     public static void SavePlayer(Player player){
 
         BinaryFormatter bf = new BinaryFormatter();
         var createdir = Directory.CreateDirectory(Application.persistentDataPath + "/saves");
         String dir = Application.persistentDataPath + "/saves";
         PlayerData data = new PlayerData (player);
 
         DirectoryInfo dir_i = new DirectoryInfo(dir);
         FileInfo[] info = dir_i.GetFiles("*.wyrm");
         foreach (FileInfo f in info) {
             Debug.Log (f);
         }
 
         FileStream stream = new FileStream (dir + "/player" + (info.Length + 1) + ".wyrm", FileMode.Create);
 
         bf.Serialize (stream, data);
         stream.Close ();
     }
 
     public static float[] LoadPlayer(){
 
         String dir = Application.persistentDataPath + "/saves";
 
         DirectoryInfo dir_i = new DirectoryInfo(dir);
         FileInfo[] info = dir_i.GetFiles("*.save");
         foreach (FileInfo f in info) {
             Debug.Log (f);
         }
 
         if (info.Length >= 1) {
             
             BinaryFormatter bf = new BinaryFormatter ();
             var createdir = Directory.CreateDirectory(Application.persistentDataPath + "/saves");
             FileStream stream = new FileStream (dir + "/player" + (info.Length) + ".save", FileMode.Open);
             PlayerData data = bf.Deserialize (stream) as PlayerData;
 
             stream.Close ();
             return data.stats;
         } else {
             return null;
         }
     }
 }
 
 [Serializable] //serializable means it is able to be saved
 public class PlayerData {
 
     public float[] stats;
 
     public PlayerData(Player player){
         stats = new float[5]; //create an empty array and use it to store values
         stats [0] = player.Level; //you can change these into whatever you want to save, but it must be either a float or int.
         stats [1] = player.Experience;
         stats [2] = player.transform.position.x;
         stats [3] = player.transform.position.y;
         stats [4] = player.transform.position.z;
     }
 }

Now that you have a SaveLoadManager you must create a Save() and Load() method inside your Player script. If you want to save booleans as integers you can look up any tutorial on it, such as this: Stack Overflow Tutorial

 public void Save(){ //compress the data into Binary using the SaveLoadManager
         Debug.Log ("Saving data (player)");
 
         SaveLoadManager.SavePlayer (this); //you do not need a reference to the SaveLoadManager as it is not MonoBehavior
     }
     public void Load(){ //load the data from the file and set the values accordingly
         Debug.Log ("Loading data (player)");
 
         float[] loadedStats = SaveLoadManager.LoadPlayer (); //grab the list of values that are returned from loading and set them into a new array
 
         Level = (int) loadedStats [0]; //level is an int, so you can save ints as floats and load them back into ints
         Experience = loadedStats [1];
 
         transform.position = new Vector3 (loadedStats[2],loadedStats[3],loadedStats[4]); //this is how you can save your exact player position

You can drag the transform object (the parent) and place it to the Project menu